# All Educational Materials for MODR 2640 at York University (YORKU)

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## MODR 2640 Study Guide - Final Guide: Logical Truth

2 Page

19 Nov 2012

Classify in terms of symmetry, transitivity, and reflexivity. (like 13-4) 10-1: note that capitals stand for relations and lower case letters stand for

View Document## R November 17, 2011.pdf

1 Page

19 Nov 2012

Commutation (p v q) (q v p) (p q) (q p) Association p v (q v r) (p v q) v r p (q v r) (p q) r. Distribution p (q v r) (p v q) v (p r) p v (q r) (p v q)

View Document## MODR 2640 Lecture Notes - Truth Table, Tilde

1 Page

19 Nov 2012

Either sam is fighting with his wife or his business is failing. Exclusive: rules it out: truth-functional compound statement. A truth functional compo

View Document## MODR 2640 Lecture Notes - Logical Form, Modus Ponens, Modus Tollens

2 Page

19 Nov 2012

2 important differences between truth tables and proofs: truth tables are mechanical-- proofs require thought, truth tables always get a definite answe

View Document## R March 1, 2012.pdf

1 Page

19 Nov 2012

Remember-- (x)fx requires that every substitution instance of fx is true. Some holds for more complex sentences: (x)(fx gx) requires every substitution

View Document## MODR 2640 Lecture Notes - November 3, Truth Table, Logical Equivalence

2 Page

19 Nov 2012

The conditional when antecedent is the conjunction of the premises and whose consequent is the conclusion (a b) c. Argument is valid iff corresponding

View Document## MODR 2640 Lecture Notes - Sentence Clause Structure, Truth Table

2 Page

19 Nov 2012

Most of what we know developed in the last 100-150 years. Symbols developed as a way to combine sentences. A sentence is compound if it contains anothe

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